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When people first began to drill for oil, their 1 were not scientific . They just 2 round the country and asked themselves, “ 3 shall we drill a well?” Sometimes they chose the 4 because they found oil on the 5 . ut they chose the place for no 6 reason . They took a 7 .
Drilling an oil well is 8 , and the work can be 9 . In the past there were often 10 . Sometimes the drilling suddenly 11 the rocks into an oil-trap. The great 12 inside the trap then caused an explosion (爆炸) . Oil and gas shot up the 13 and made great gushers (井喷) in the 14 . Sometimes there were great 15 , which people could see many 16 away.
Today drilling is very scientific. Scientists and engineers plan all the work. They plan the 17 of wells. They choose their positions in the 18 . They also advise and 19 the men who drill the wells how to work better. 20 , there are very few accidents today.
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| The U.S. government has recently helped people learn more about the dangers of earthquakes by publishing a map. This map shows the 1 of an earthquake in each part of the country. The areas of map where earthquakes are 2 likely to break out are called earthquake "belts". The government is working hard to help 3 the answer to these two questions: 1. Can we foretell earthquakes? 2. Can we control earthquakes? To answer the first question, scientists are looking very 4 at the most active fault systems in the country, 5 the San Andress fault in California. A fault is a break between two sections of the earth's 6 . These breaks between sections are the places where earthquakes happen. Scientists look at the faults 7 changes which might show that an earthquake was 8 to happen. But it will probably be many years 9 we can foretell earthquakes accurately (精确地). And the control of earthquake is even 10 away. Nevertheless, there have been some interesting 11 in the field of controlling earthquakes. The most interesting 12 the Rocky Mountain Arsenal earthquakes. Here water was put into a layer of rocks 4,000 meters below the surface of the ground. Shortly after this injection of water, there were a small number of earthquakes. Scientists have 13 that the water that was injected into the rocks worked like oil 14 each other. When the water "oiled" the fault, it became slippery and the 15 of an earthquake was released (释放). Scientists are still 16 at the site of these earthquakes. They have realized that there is a 17 between the injection of the water and the earthquake 18 . They have supposed that it 19 be possible to inject some 20 of fluid like water into faults and change one big earthquake into a number of small, harmless earthquakes. | ||||
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Reading Comprehension
Read the following passages, and choose the best answer that can answer the question.
The U. S. government has recently helped people learn more about the dangers earthquakes by publishing a map. This map shows the chances of an earthquake in each part of the country. The areas of the map where earthquakes arc most likely to occur are called earthquake “belt”. The government is spending a great deal of money and is working hard help discover the answer to these two questions：1．Can we predict(预测) earthquakes? 2．Can we control earthquakes?
To answer the first question, scientist are looking very closely at the most active fault (断层) systems in the country, such as the San Andreas fault in California. A fault is a break between two sections of the earth's surface. These breaks between sections are the places where earthquake occur. Scientists lock at the faults for changes which might show that earthquake was about to occur. But it will probably he many years before we can predict earthquakes accurately, And the control of earthquakes is even farther away.
However, there have been some interesting developments in the field of controlling earthquakes. The most interesting development concerns the Rocky Mountain Arsenal earthquakes. Here water was put into a layer of rocks 4000 metres below the surface of the ground. Shortly after this injection of water, there were a small number of earthquake. Scientists have decided that the water which was injected into the rocks work like oil on each other. When the water “oiled” the fault, the fault became slippery and the energy of an earthquake was released. Scientists are still experimenting at the site of these earthquakes. They have realized that there is a connection between the injection of the water and the earthquake activity. They have suggested that it might be possible to use this knowledge to prevent very big, destructive earthquakes, that is, scientists could inject some kind of fluid like water into faults and change one big earthquake into a number of small, harmless earthquakes.
1．Earthquakes belts are ________.
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A．maps that show where earthquakes are likely to occur
B．zones with a high probability of earthquakes
C．breaks between two sections of the earth's surface
D．the two layers of earth along a fault
2．The San Andreas fault is ________.
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A．an active fault system
B．a place where earthquakes have been predicted accurately
C．a place where earthquakes have been controlled
D．the location of the Rocky Mountain
3．What did scientists learn about earthquakes at the Rocky Mountain Arsenal?
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A．They occur at about 1000 meters below ground level.
B．The injection of water into earthquakes faults prevents earthquakes form occurring.
C．They are usually caused by the oil in the faults.
D．Harmful earthquakes can be possibly prevented by causing small harmless earthquakes.
4．What can be said about the experiments at Rocky Mountain Arsenal?
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A．They have no practical value in earthquake prevention.
B．They may have practical value in earthquake prevention.
C．They are certain to have practical value in earthquake prevention.
D．The article does not say anything about their practical value in earthquake prevention.
5．What is the most appropriate title for the passage?
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A．Dangers of Earthquakes.
B．Earthquake Belts and prediction.
C．Earthquake Prediction and Control.
D．Earthquake Engineering in California.
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